features
重要特性
♦ smaller size saves board space and cost
超小尺寸、节约空间和成本
♦ resettable circuit protection
自恢复保护、免维护
♦ fast time-to-trip
动作时间快
♦ low resistance
低内阻值
♦ lead-free and compliant with the european union rohs directive2002/95/ec
符合欧州rohs无铅环保要求
b. application
应用范围
polymer resettable fuse for over-current, over-temperature andshort-circuit protection
可恢复保险丝用于过流、温度和线路短路保护
♦ loudspeaker、vcd、dvd、transformers、automotiveelectronics、electronic toys、motors
音响喇叭、vcd、dvd机、变压器、汽车电子、电子玩具、马达（电动工具）
♦ ieee1394 ports
ieee1394通讯接口
♦ usb hub, ports and peripherals
usb交换机及外围设备
♦ phones
电话设备
♦ data communication
数据交换机
♦ modems/ ethernet/lan
调制解调器/以太网
c. general description
简要概述
polymer resettable fuse are made of polymeric ptc materials whichis a matrix of
自恢复保险丝是聚合物高分子材料通过特殊工艺而成，
polymer containing dispersed conductive particles. generally, thedevice has a very
高分子粒子按一定的规律排列，正常情况下，自恢复保险丝器件处于低内阻状态，
low resistance. if an over-current happened, as a response to thedamage current,
当电路中电流突然增大时，
the resistance will immediately increase to very high, reducing thecurrent of the
器件将会在短时间内阻值升到高阻状态、高分子膨胀
circuit to a safe value that the loading can carry. once fault tothe circuit is weed out
从而起到减少过电流；
and power is recuperated, the polymer will deflate itself , thedevice will reset and is
一旦故障排除后，高分子将会恢复正常规则排序。
ready for normal operation.

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